|Vartapetian, Boris - RUSSIAN ACADEMY OF SCIENC|
Submitted to: Plant Stress
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: November 30, 2007
Publication Date: November 30, 2007
Citation: Sachs, M.M., Vartapetian, B.B. 2007. Plant anaerobic stress I. Metabolic adaptation to oxygen deficiency. Plant Stress. 1(2):123-135. Interpretive Summary: The goal was to characterize molecular and physiological events induced during low oxygen conditions in plants during flooding. The results indicate that flooding causes a number of changes that allow some plants to adapt to a low oxygen environment. Some plants were found to have special adaptations to flooding stress. The understanding of these mechanisms in a plant’s response to low oxygen-stress conditions will allow for a greater understanding of how plants attempt to cope with this stress and may allow for effective methods to produce crop plants that are tolerant to flooding.
Technical Abstract: The establishment and further development of a novel branch of science in the field of ecological physiology, biochemistry and molecular biology, dedicated to plant life under hypoxic and anoxic stresses, is considered in the present review focusing upon strategies of adaptation and injury exhibited by plants under hypoxia and anoxia. Taking into account that the results of investigations over the last few decades confirmed the conclusions about the existence of two general strategies for plant adaptation to hypoxic and anoxic stresses: (a) true tolerance realized at the molecular level due to cardinal rearrangement of cellular metabolism under conditions of oxygen deficiency or complete absence of oxygen, and (b) apparent tolerance that is brought about by avoidance of anaerobiosis thanks to long-distance oxygen translocation, the accumulated experimental information is considered and discussed mainly with respect to basic strategies. The physiological role of anaerobic proteins synthesized under conditions of hypoxia and anoxia as well as advances in molecular biology and molecular genetics in the study of regulation of synthesis of these proteins at the level of transcription, translation and post-translation are discussed. The key significance of energy (glycolysis and fermentation) and related processes of carbohydrate (mobilization and utilization of reserved carbohydrate) metabolism in plant metabolic adaptation to oxygen deficiency is stressed. Special attention is given to an earlier period of active investigations in this field that played a substantial role in the establishment and international recognition of this new biological discipline. The strategy of avoidance of anaerobiosis by long-distance oxygen translocation and some other aspects of plant life under hypoxia and anoxia will be considered in the following publication (Vartapetian, Sachs, Fagerstedt 2008).